如何从字符串中去除非 ASCII 字符？（在 C# 中）
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How can you strip non-ASCII characters from a string? (in C#)
提问by philcruz
How can you strip non-ASCII characters from a string? (in C#)
如何从字符串中去除非 ASCII 字符？（在 C# 中）
采纳答案by philcruz
string s = "s?me string";
s = Regex.Replace(s, @"[^\u0000-\u007F]+", string.Empty);
回答by bzlm
Here is a pure .NET solution that doesn't use regular expressions:
这是一个不使用正则表达式的纯 .NET 解决方案：
string inputString = "R?ksm?rg?s";
string asAscii = Encoding.ASCII.GetString(
Encoding.Convert(
Encoding.UTF8,
Encoding.GetEncoding(
Encoding.ASCII.EncodingName,
new EncoderReplacementFallback(string.Empty),
new DecoderExceptionFallback()
),
Encoding.UTF8.GetBytes(inputString)
)
);
It may look cumbersome, but it should be intuitive. It uses the .NET ASCII encoding to convert a string. UTF8 is used during the conversion because it can represent any of the original characters. It uses an EncoderReplacementFallback to to convert any non-ASCII character to an empty string.
它可能看起来很麻烦，但它应该是直观的。它使用 .NET ASCII 编码来转换字符串。在转换过程中使用 UTF8，因为它可以表示任何原始字符。它使用 EncoderReplacementFallback 将任何非 ASCII 字符转换为空字符串。
回答by Bent Rasmussen
Inspired by philcruz's Regular Expression solution, I've made a pure LINQ solution
受philcruz 的正则表达式解决方案的启发，我做了一个纯 LINQ 解决方案
public static string PureAscii(this string source, char nil = ' ')
{
var min = '\u0000';
var max = '\u007F';
return source.Select(c => c < min ? nil : c > max ? nil : c).ToText();
}
public static string ToText(this IEnumerable<char> source)
{
var buffer = new StringBuilder();
foreach (var c in source)
buffer.Append(c);
return buffer.ToString();
}
This is untested code.
这是未经测试的代码。
回答by sinelaw
If you want not to strip, but to actually convert latin accented to non-accented characters, take a look at this question: How do I translate 8bit characters into 7bit characters? (i.e. ü to U)
如果您不想剥离，而是实际将拉丁重音字符转换为非重音字符，请查看以下问题：如何将 8 位字符转换为 7 位字符？（即ü到U）
回答by Anonymous coward
I used this regex expression:
我使用了这个正则表达式：
string s = "s?me string";
Regex regex = new Regex(@"[^a-zA-Z0-9\s]", (RegexOptions)0);
return regex.Replace(s, "");
回答by MonsCamus
I found the following slightly altered range useful for parsing comment blocks out of a database, this means that you won't have to contend with tab and escape characters which would cause a CSV field to become upset.
我发现以下稍微改变的范围对于解析数据库中的注释块很有用，这意味着您不必与会导致 CSV 字段变得混乱的制表符和转义符争用。
parsememo = Regex.Replace(parsememo, @"[^\u001F-\u007F]", string.Empty);
If you want to avoid other special characters or particular punctuation check the ascii table
如果您想避免其他特殊字符或特定标点符号，请检查ascii 表
回答by rjp
no need for regex. just use encoding...
不需要正则表达式。只需使用编码...
sOutput = System.Text.Encoding.ASCII.GetString(System.Text.Encoding.ASCII.GetBytes(sInput));
回答by Josh
I believe MonsCamus meant:
我相信 MonsCamus 的意思是：
parsememo = Regex.Replace(parsememo, @"[^\u0020-\u007E]", string.Empty);
回答by Jeppe Stig Nielsen
This is not optimal performance-wise, but a pretty straight-forward Linq approach:
这不是最佳性能，而是一种非常直接的 Linq 方法：
string strippedString = new string(
yourString.Where(c => c <= sbyte.MaxValue).ToArray()
);
The downside is that all the "surviving" characters are first put into an array of type char[]which is then thrown away after the stringconstructor no longer uses it.
缺点是所有“幸存”的字符首先被放入一个类型的数组中char[]，然后在string构造函数不再使用它后将其丢弃。
回答by Polynomial Proton
I came here looking for a solution for extended ascii characters, but couldnt find it. The closest I found is bzlm's solution. But that works only for ASCII Code upto 127(obviously you can replace the encoding type in his code, but i think it was a bit complex to understand. Hence, sharing this version). Here's a solution that works for extended ASCII codes i.e. upto 255which is the ISO 8859-1
我来这里寻找扩展 ascii 字符的解决方案，但找不到。我找到的最接近的是bzlm's solution。但这仅适用于高达 127 的 ASCII 代码（显然您可以替换他代码中的编码类型，但我认为理解起来有点复杂。因此，共享此版本）。这是一个适用于扩展 ASCII 代码的解决方案，即高达 255，即ISO 8859-1
It finds and strips out non-ascii characters(greater than 255)
它查找并去除非 ascii 字符（大于 255）
Dim str1 as String= "a, ??? or ?u? n?i?++$-?!??4?od;/?'?;?:?)///1!@#"
Dim extendedAscii As Encoding = Encoding.GetEncoding("ISO-8859-1",
New EncoderReplacementFallback(String.empty),
New DecoderReplacementFallback())
Dim extendedAsciiBytes() As Byte = extendedAscii.GetBytes(str1)
Dim str2 As String = extendedAscii.GetString(extendedAsciiBytes)
console.WriteLine(str2)
'Output : a, ??? or ?u ni++$-!??4od;/';:)///1!@#$%^yz:
Here's a working fiddle for the code
Replace the encoding as per the requirement, rest should remain the same.
根据要求更换编码，其余保持不变。
